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I have a 2 year old 17.5 Briggs engine on a 36" walk behind. Now it's not increasing rpm's when it gets a load on it from long grass. Still mows ok, but I'm at a loss. When governor is operated by hand it revs up. Rod and spring are attached at the carb. What's the adjustment procedure? Thanks!

New to me a 1993 Lawnboy model # 10735 2 stroke. Running the opti 2 cycle oil, just as i do in my other 2 cycle equipment Engine starts and runs ,but runs rich/ and surges. I have a new RJ12c spark plug in it and have blown out the were the air/altitude screw goes into the carb. and made...